axios 进行同步请求(async+await)

axios({
    method: 'get',
    url: fileData,
    responseType: 'blob'
  }).then(function...)

export const desFileList = async (fileData: any) => {
  const response = await axios({
    method: 'get',
    url: fileData,
    responseType: 'blob'
  });
 return response 
 });

// new FileReader().onload 异步转同步
return new Promise((resolve, reject) => {
	const readers = new FileReader();
    readers.readAsArrayBuffer(fileBlob);
    readers.onload = () => {...
		resolve(xxx);
	}
});